gilson



' (No Model.) .2 Shets-Sheet 1.

J. GILSON.

\GHAIR.

No. 555,694. v PatentedMaQr. a, 1896.

(No Model.) 2 Sheets-Sheet 2.

J. GILSON.

CHAIR.

No. 555,694. Patented Mar. 3, 1896.

UNITED STATES PATENT OFFICE.

JOIIN GILSON, OF PORT WASHINGTON, WVISOONSIN, ASSIGNOR TO THE GILSON MANUFACTURING COMPANY, OF SAME PLACE.

CHAIR.

SPECIFICATION forming part of Letters Patent No. 555,694, dated March 3, 1896.

Application filed August 7, 1895: Serial No. 558,483. (No model.)

To aZZ whom it may concern.-

Be it known that I, JOHN GILSON, a citizen of the United States, and a resident of Port Washington, in the county of Ozaukee and State of "Wisconsin, have-invented certain new and useful Improvements in Chairs and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention has for its obj cct to compensate for the radial shift or strain on the spring-tension rod of a tilting chair, as well as to provide for adjusting the tension without changing the radius of said shift or strain.

My invention also has for its object to provide for regulating and preventing the tilt of the chair-seat at will.

These objects are attainable by certain peculiarities of construction and combination of parts hereinafter set forth with reference to the accompanying drawings and subsequently claimed.

In the drawings, Figure 1 represents a section on an irregular plane, indicated by line 1 1 in Fig. 2, to illustrate an assemblage of various parts comprehended in my improvements and constituting the metal work for a tilting chair; Fig. 2, a plan view from above the spider portion of the structure shown in Fig. 1; and Fig. 3, another detail plan view, partly in horizontal section, on line 4 4 of Fig. 1.

Referring by letter to the drawings, A represents the spider to which a tilting-chair seatis made fast, the preferred form of spider being a skeleton casting comprising a pair of longitudinal bars joined by transverse braces. In practice the spider is pivotally connected to a standard B, and as herein shown it is preferable to provide said spider with depending pivot-ears b and have vertical arms 0 on thestandard come inside of said ears. A rod O is herein shown as constituting the pivotal connection between the spider and standard, this rod being run through the lower ends of the depending spider-ears and the adjacent standard-arms.

It is common practice to provide the spider with depending stops in opposite directions from the standard-arms, these stops serving to limit tilt of the spider in either direction,

but as one of the features of my invention is to provide for regulating or preventing tilt of said spider the latter is herein shown as having longitudinal slots (1 through which said standardarms extend. The greatest possible tilt of the spider in either direction depends on the length of the slots engaged by the standard-arms, and to lessen or prevent the tilt I employ a horizontal transverse plate D adjustable on top of the spider in front of said standard-arms. As herein shown the plate D may have oblique slots 6 engaged by set-screws f that turn in the spider; but I do not limit myself to any particular means for obtaining an adjustment and set of said plate. It will be understood that an adjustment of the plate toward the rear will practically close the spider-slots d in proportion to the adjustment, and therefore the possible backward tilt of the spider may be lessened or entirely overcome at will.

One or more spiral springs E are employed in connection with the spider to control tilt of the same, the arrangement of the spring or springs being a matter of common knowledge in the art to which my invention relates.

It is the general practice to employ a pair of springs E, supported at their inner ends by bosses g on the spider, and at their outer ends by other bosses h ona plate F connected to a rod that connects in some manner with the standard. It is also general practice to provide for a longitudinal adjustment of the rod in order to vary the springtension.

One of the objects of my invention being to compensate for radial shift or strain on the spring-tension rod, the latter is made with a hinge-joint intermediate of its extremities.

One section, G, of the hinge-jointed tensionrod is preferably in adjustable connection with the standard, and as herein shown it may consist of a hook having a screw-threaded shank extended through a bail 1' connecting the standard-arms 0 above specified, this shank being engaged with an adjusting-nut H that bears against said bail. lVhen an adjustable hook constitutes one section of the rod the other section, G, of this rod has an eye engaged by the hook to thus form the hingejoint.

The yield of the aforesaid rod to radial shift or strain takesplace at the hinge-joint, and this being the case it will be observed that the radius of this shift or strain is always the same, regardless of the tension of adjustment, this beinganother important feature of my improvements.

As herein shown, the hinge-jointed springtension rod may have its section G made from a flat bar of steel, the plate F being cast with a slot for the engagement of said rod-section. At times the plate may be quite loose in its fit on the rod'section, and toprevent rock of said plate and consequent dislodgement of the springs E, I provide the outer end of said rod-section with a head 3 that bears against thefiat rear face of the plate. The head may befastened'to the rod-section G by any suitable means, but it is preferable to castvit thereon, an openingbeing made in said rodsection to receive some of the cast metal, whereby the retention of said headin'place is assured.

Having thus described my invention, what I claim as new, and desire to secureby Letters Patent, is-

1. The combination of a'suitable standard having vertical arms united by a bail, a pivotal spring-controlled spider, and a springtension rod that has ahinge-joint intermediate of its extremities and extends through the bail, together with an adjustment-nut operative on an end of the rod against said bail.

2. The combination of a standard having vertical arms, a pivotal spring controlled spider provided with longitudinal slots en gaged by the standard-arms, and a transverse plate adjustably secured on the spider in opposition to said standard-arms.

3. The combination of a suitable standard, a spider pivoted thereto, a hinge-jointed rod in connection with the standard and having a flat bar-section, aplatehavingaslot loosely engaged by the fiat barrod-scction, ahead on said rod-section arranged to bear against the Hat rear face of said plate, and springs sup ported by the spider and plate.

4. The combination of a suitable standard, a spider pivoted thereto, a hingcjointed rod in connection With'tlie standard, aplate having an aperture loosely engaged by aseetion of the rod, a head on this rod-section arrangedtobear against the fiat rear face of said plate, and springs supported by the spider and plate.

In testimony that I claim the foregoing I have hereunto set my hand, at Milwaukee, in the county of Milwaukee and State ofWVisconsin, in the presence of two witnesses.

J OIIN GILSON.

\Vitnesses:

N. E. OLIPHANT, HENRY DANKERT. 

